| Gamma ray: | A high energy photon. |
| Graham's law of diffusion: | The rate of diffusion of a gas is inversely proportional to the square root of its density. |
| Gravitational constant (G): | The constant of proportionality in Newton's law of gravitation, G = 6.67 x 10-11 Nm2/kg2 |
| Gravitational potential at a point: | The amount of work done against the gravitational forces to move a particle of unit mass from infinity to that point. |
| Gravitational potential energy: | The energy possessed by a body due to its position. |
| Gravity: | The gravitational attraction at the surface of a planet or other celestial body. |
| Ground state: | The lowest energy state of an atom. |
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